Question

我从一个类似于["2016-05-28", "2016-05-29", "2016-05-30", "2016-05-31"]

的json字符串开始

我试图将其转换为Saturday 5/28 Sunday 5/29。

我查看了这些答案，并试图实现相同的目标： Why does Date.parse give incorrect results?和 Convert date in string to date object for inserting in database

但是我得错了一天的输出。 5/28在星期六时显示为Tuesday, 5/28。

JSFiddle：https://jsfiddle.net/pum40hyx/

这是我的代码，我将日期转换为我想要的字符串：

function convertToNiceDate(inputDate)
{
    var days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
    var splitString = inputDate.split("-");

    currentDate = new Date(splitString[0], splitString[1], splitString[2]);
    var day = currentDate.getDate();
    var month = currentDate.getMonth();

    //this is the problematic line!
    var dayOfWeek = days[currentDate.getDay()];

    var dateString = dayOfWeek + ", " + month + "/" + day;
    return dateString;
}

Answer 1

使用0-11格式构建新Date时，月份范围为new Date(year, month[, day[, ...)。因此，当字符串被拆分时，1月应为0，而不是1。

<强>月：表示月份的整数值，从1月的0开始到12月的11。

这是一个证明重点的黑客解决方案：

function convertToNiceDate(inputDate)
{
    var days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
    var splitString = inputDate.split("-");

    currentDate = new Date(splitString[0], +splitString[1]-1, splitString[2]);
    var day = currentDate.getDate();
    var month = currentDate.getMonth() + 1;

    //this is the problematic line!
    var dayOfWeek = days[currentDate.getDay()];

    var dateString = dayOfWeek + ", " + month + "/" + day;
    return dateString;
}

document.body.innerHTML = convertToNiceDate('2016-01-01');

您还可以执行以下操作：

function convertToNiceDate(inputDate) {
  var days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
  var splitString = inputDate.split("-");

  currentDate = new Date(inputDate);
  var day = currentDate.getUTCDate();
  var month = currentDate.getUTCMonth() + 1;

  //this is the problematic line!
  var dayOfWeek = days[currentDate.getUTCDay()];

  var dateString = dayOfWeek + ", " + month + "/" + day;
  return dateString;
}

document.body.innerHTML = convertToNiceDate('2016-01-01');

Answer 2

使用setter（也许你应该在所有这些上使用parseInt）：

var currentDate //with var
   = new Date();
   currentDate.setFullYear(splitString[0]);
   currentDate.setDate(splitString[2]);
   currentDate.setMonth(parseInt(splitString[1])-1);

   //do something with your date object

Answer 3

我刚刚发现，当你分割字符串时，你的日期月份（这里是splitString [1]）总是太过分了。我认为这是因为它需要月份（5）的数组，这将代表六月而不是五月（它从一月份的0开始）。尝试使用：

currentDate = new Date(splitString.toString());

错误的结果在JavaScript中解析日期

3 个答案: